How do I concatenate strings in Swift?

Question

How to concatenate string in Swift?

In Objective-C we do like

NSString *string = @\"Swift\";
NSString *resultStr = [string stringByAppen         


        

Answer 1

Xcode didn't accept optional strings added with a normal string. I wrote this extensions to solve that problem:

extension String {
    mutating func addString(str: String) {
        self = self + str
    }
}

Then you can call it like:

var str1: String?
var str1 = "hi"
var str2 = " my name is"
str1.addString(str2)
println(str1) //hi my name is

However you could now also do something like this:

var str1: String?
var str1 = "hi"
var str2 = " my name is"
str1! += str2